CPW Fed Ultrawideband Antenna for Microwave Imaging Application

A accurate microwave imaging system can be implemented using the wireless communication technology known as ultra-wideband (UWB). As UWB uses a brief pulse signal, it also consumes very low power and is very robust in multipath settings. Numerous UWB antennas were suggested to suit the required criteria for microwave imaging. In this study, a compact UWB antenna operating in the 3.1 GHz–11.8 GHz frequency range is proposed using a FR-4 substrate. The antenna's overall dimension is 25×12.5×1.6 mm3, or 0.258λ0×0.129 λ0×0.02 λ0 at the lowest operating frequency. Coplanar waveguide is the feeding technique used for the transmission line is design. To increase the working frequency range, in the hexagonal shaped radiator a ribbon-shaped slot and a semi hexagonal ring slot are etched. The proposed UWB antenna is constructed and measured for validation. It has good impedance performance from 3.1 to 11.8 GHz and omnidirectional patterns across the range of frequencies.